根据原始文档Spring Framework Reference Documentation来建立Spring HelloWorld。
下面是Java工程的目录以及所需的jar包:
1.在src目录下建立beans.xml文件,并从spring Framework Reference Documentation中Core Technologies -> Configuration metadata拷贝配置文件到该文件中,然后根据需要修改配置文件
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="userDaoImpl" class="com.bjsxt.dao.impl.UserDAOImpl">
<!-- collaborators and configuration for this bean go here -->
</bean>
<bean id="userService" class="com.bjsxt.service.UserService">
<property name="userDAO" ref="userDaoImpl" />
<!-- collaborators and configuration for this bean go here -->
</bean>
<!-- more bean definitions go here -->
</beans>
2.接口UserDao
package com.bjsxt.dao;
import com.bjsxt.model.User;
public interface UserDAO {
public void save(User user);
}
3.接口UserDao的实现UserDAOImpl
package com.bjsxt.dao.impl;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;
public class UserDAOImpl implements UserDAO {
public void save(User user) {
System.out.println("user saved!");
}
}
4.编写一个User
package com.bjsxt.model;
public class User {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
5.编写UserService
package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;
public class UserService {
private UserDAO userDAO;
public void add(User user) {
userDAO.save(user);
}
public UserDAO getUserDAO() {
return userDAO;
}
public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}
}
6.编写测试代码UserServiceTest
package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.bjsxt.model.User;
//Dependency Injection
//Inverse of Control
public class UserServiceTest {
@Test
public void testAdd() {
/*ApplicationContext是建立在BeanFactory之上的,BeanFactory它只是完成了Bean工厂的一些功能,像
*Bean的声明周期它都处理不了。而ApplicationContext除了能完成BeanFactory所有的功能之外,还能够完成
*一些其他的附加的功能,比如说bean的声明的周期。
*/
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
UserService service = (UserService)ctx.getBean("userService");
User u = new User();
u.setUsername("zhangsan");
u.setPassword("zhangsan");
service.add(u);
}
}